[thirdparty/git.git] / receive-pack.c

#include "cache.h"
#include "pack.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"
#include "exec_cmd.h"
#include "commit.h"
#include "object.h"
#include <sys/wait.h>

static const char receive_pack_usage[] = "git-receive-pack <git-dir>";

static int deny_non_fast_forwards = 0;
static int unpack_limit = 5000;
static int report_status;

static char capabilities[] = " report-status delete-refs ";
static int capabilities_sent;

static int receive_pack_config(const char *var, const char *value)
{
	git_default_config(var, value);

	if (strcmp(var, "receive.denynonfastforwards") == 0)
	{
		deny_non_fast_forwards = git_config_bool(var, value);
		return 0;
	}

	if (strcmp(var, "receive.unpacklimit") == 0)
	{
		unpack_limit = git_config_int(var, value);
		return 0;
	}

	return 0;
}

static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
	if (capabilities_sent)
		packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	else
		packet_write(1, "%s %s%c%s\n",
			     sha1_to_hex(sha1), path, 0, capabilities);
	capabilities_sent = 1;
	return 0;
}

static void write_head_info(void)
{
	for_each_ref(show_ref, NULL);
	if (!capabilities_sent)
		show_ref("capabilities^{}", null_sha1, 0, NULL);

}

struct command {
	struct command *next;
	const char *error_string;
	unsigned char old_sha1[20];
	unsigned char new_sha1[20];
	char ref_name[FLEX_ARRAY]; /* more */
};

static struct command *commands;

static char update_hook[] = "hooks/update";

static int run_update_hook(const char *refname,
			   char *old_hex, char *new_hex)
{
	int code;

	if (access(update_hook, X_OK) < 0)
		return 0;
	code = run_command(update_hook, refname, old_hex, new_hex, NULL);
	switch (code) {
	case 0:
		return 0;
	case -ERR_RUN_COMMAND_FORK:
		return error("hook fork failed");
	case -ERR_RUN_COMMAND_EXEC:
		return error("hook execute failed");
	case -ERR_RUN_COMMAND_WAITPID:
		return error("waitpid failed");
	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
		return error("waitpid is confused");
	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
		return error("%s died of signal", update_hook);
	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
		return error("%s died strangely", update_hook);
	default:
		error("%s exited with error code %d", update_hook, -code);
		return -code;
	}
}

static int update(struct command *cmd)
{
	const char *name = cmd->ref_name;
	unsigned char *old_sha1 = cmd->old_sha1;
	unsigned char *new_sha1 = cmd->new_sha1;
	char new_hex[41], old_hex[41];
	struct ref_lock *lock;

	cmd->error_string = NULL;
	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
		cmd->error_string = "funny refname";
		return error("refusing to create funny ref '%s' locally",
			     name);
	}

	strcpy(new_hex, sha1_to_hex(new_sha1));
	strcpy(old_hex, sha1_to_hex(old_sha1));

	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
		cmd->error_string = "bad pack";
		return error("unpack should have generated %s, "
			     "but I can't find it!", new_hex);
	}
	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
	    !is_null_sha1(old_sha1) &&
	    !strncmp(name, "refs/heads/", 11)) {
		struct commit *old_commit, *new_commit;
		struct commit_list *bases, *ent;

		old_commit = (struct commit *)parse_object(old_sha1);
		new_commit = (struct commit *)parse_object(new_sha1);
		bases = get_merge_bases(old_commit, new_commit, 1);
		for (ent = bases; ent; ent = ent->next)
			if (!hashcmp(old_sha1, ent->item->object.sha1))
				break;
		free_commit_list(bases);
		if (!ent)
			return error("denying non-fast forward;"
				     " you should pull first");
	}
	if (run_update_hook(name, old_hex, new_hex)) {
		cmd->error_string = "hook declined";
		return error("hook declined to update %s", name);
	}

	if (is_null_sha1(new_sha1)) {
		if (delete_ref(name, old_sha1)) {
			cmd->error_string = "failed to delete";
			return error("failed to delete %s", name);
		}
		fprintf(stderr, "%s: %s -> deleted\n", name, old_hex);
	}
	else {
		lock = lock_any_ref_for_update(name, old_sha1);
		if (!lock) {
			cmd->error_string = "failed to lock";
			return error("failed to lock %s", name);
		}
		write_ref_sha1(lock, new_sha1, "push");
		fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
	}
	return 0;
}

static char update_post_hook[] = "hooks/post-update";

static void run_update_post_hook(struct command *cmd)
{
	struct command *cmd_p;
	int argc;
	const char **argv;

	if (access(update_post_hook, X_OK) < 0)
		return;
	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
		if (cmd_p->error_string)
			continue;
		argc++;
	}
	argv = xmalloc(sizeof(*argv) * (1 + argc));
	argv[0] = update_post_hook;

	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
		char *p;
		if (cmd_p->error_string)
			continue;
		p = xmalloc(strlen(cmd_p->ref_name) + 1);
		strcpy(p, cmd_p->ref_name);
		argv[argc] = p;
		argc++;
	}
	argv[argc] = NULL;
	run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
}

/*
 * This gets called after(if) we've successfully
 * unpacked the data payload.
 */
static void execute_commands(void)
{
	struct command *cmd = commands;

	while (cmd) {
		update(cmd);
		cmd = cmd->next;
	}
	run_update_post_hook(commands);
}

static void read_head_info(void)
{
	struct command **p = &commands;
	for (;;) {
		static char line[1000];
		unsigned char old_sha1[20], new_sha1[20];
		struct command *cmd;
		char *refname;
		int len, reflen;

		len = packet_read_line(0, line, sizeof(line));
		if (!len)
			break;
		if (line[len-1] == '\n')
			line[--len] = 0;
		if (len < 83 ||
		    line[40] != ' ' ||
		    line[81] != ' ' ||
		    get_sha1_hex(line, old_sha1) ||
		    get_sha1_hex(line + 41, new_sha1))
			die("protocol error: expected old/new/ref, got '%s'",
			    line);

		refname = line + 82;
		reflen = strlen(refname);
		if (reflen + 82 < len) {
			if (strstr(refname + reflen + 1, "report-status"))
				report_status = 1;
		}
		cmd = xmalloc(sizeof(struct command) + len - 80);
		hashcpy(cmd->old_sha1, old_sha1);
		hashcpy(cmd->new_sha1, new_sha1);
		memcpy(cmd->ref_name, line + 82, len - 81);
		cmd->error_string = "n/a (unpacker error)";
		cmd->next = NULL;
		*p = cmd;
		p = &cmd->next;
	}
}

static const char *parse_pack_header(struct pack_header *hdr)
{
	char *c = (char*)hdr;
	ssize_t remaining = sizeof(struct pack_header);
	do {
		ssize_t r = xread(0, c, remaining);
		if (r <= 0)
			return "eof before pack header was fully read";
		remaining -= r;
		c += r;
	} while (remaining > 0);
	if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
		return "protocol error (pack signature mismatch detected)";
	if (!pack_version_ok(hdr->hdr_version))
		return "protocol error (pack version unsupported)";
	return NULL;
}

static const char *pack_lockfile;

static const char *unpack(void)
{
	struct pack_header hdr;
	const char *hdr_err;
	char hdr_arg[38];

	hdr_err = parse_pack_header(&hdr);
	if (hdr_err)
		return hdr_err;
	snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
			ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));

	if (ntohl(hdr.hdr_entries) < unpack_limit) {
		int code;
		const char *unpacker[3];
		unpacker[0] = "unpack-objects";
		unpacker[1] = hdr_arg;
		unpacker[2] = NULL;
		code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
		switch (code) {
		case 0:
			return NULL;
		case -ERR_RUN_COMMAND_FORK:
			return "unpack fork failed";
		case -ERR_RUN_COMMAND_EXEC:
			return "unpack execute failed";
		case -ERR_RUN_COMMAND_WAITPID:
			return "waitpid failed";
		case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
			return "waitpid is confused";
		case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
			return "unpacker died of signal";
		case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
			return "unpacker died strangely";
		default:
			return "unpacker exited with error code";
		}
	} else {
		const char *keeper[6];
		int fd[2], s, len, status;
		pid_t pid;
		char keep_arg[256];
		char packname[46];

		s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
		if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
			strcpy(keep_arg + s, "localhost");

		keeper[0] = "index-pack";
		keeper[1] = "--stdin";
		keeper[2] = "--fix-thin";
		keeper[3] = hdr_arg;
		keeper[4] = keep_arg;
		keeper[5] = NULL;

		if (pipe(fd) < 0)
			return "index-pack pipe failed";
		pid = fork();
		if (pid < 0)
			return "index-pack fork failed";
		if (!pid) {
			dup2(fd[1], 1);
			close(fd[1]);
			close(fd[0]);
			execv_git_cmd(keeper);
			die("execv of index-pack failed");
		}
		close(fd[1]);

		/*
		 * The first thing we expects from index-pack's output
		 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
		 * %40s is the newly created pack SHA1 name.  In the "keep"
		 * case, we need it to remove the corresponding .keep file
		 * later on.  If we don't get that then tough luck with it.
		 */
		for (len = 0;
		     len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
		     len += s);
		close(fd[0]);
		if (len == 46 && packname[45] == '\n' &&
		    memcmp(packname, "keep\t", 5) == 0) {
			char path[PATH_MAX];
			packname[45] = 0;
			snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
				 get_object_directory(), packname + 5);
			pack_lockfile = xstrdup(path);
		}

		/* Then wrap our index-pack process. */
		while (waitpid(pid, &status, 0) < 0)
			if (errno != EINTR)
				return "waitpid failed";
		if (WIFEXITED(status)) {
			int code = WEXITSTATUS(status);
			if (code)
				return "index-pack exited with error code";
			reprepare_packed_git();
			return NULL;
		}
		return "index-pack abnormal exit";
	}
}

static void report(const char *unpack_status)
{
	struct command *cmd;
	packet_write(1, "unpack %s\n",
		     unpack_status ? unpack_status : "ok");
	for (cmd = commands; cmd; cmd = cmd->next) {
		if (!cmd->error_string)
			packet_write(1, "ok %s\n",
				     cmd->ref_name);
		else
			packet_write(1, "ng %s %s\n",
				     cmd->ref_name, cmd->error_string);
	}
	packet_flush(1);
}

static int delete_only(struct command *cmd)
{
	while (cmd) {
		if (!is_null_sha1(cmd->new_sha1))
			return 0;
		cmd = cmd->next;
	}
	return 1;
}

int main(int argc, char **argv)
{
	int i;
	char *dir = NULL;

	argv++;
	for (i = 1; i < argc; i++) {
		char *arg = *argv++;

		if (*arg == '-') {
			/* Do flag handling here */
			usage(receive_pack_usage);
		}
		if (dir)
			usage(receive_pack_usage);
		dir = arg;
	}
	if (!dir)
		usage(receive_pack_usage);

	if (!enter_repo(dir, 0))
		die("'%s': unable to chdir or not a git archive", dir);

	setup_ident();
	git_config(receive_pack_config);

	write_head_info();

	/* EOF */
	packet_flush(1);

	read_head_info();
	if (commands) {
		const char *unpack_status = NULL;

		if (!delete_only(commands))
			unpack_status = unpack();
		if (!unpack_status)
			execute_commands();
		if (pack_lockfile)
			unlink(pack_lockfile);
		if (report_status)
			report(unpack_status);
	}
	return 0;
}
Commit	Line	Data
575f4974	1	#include "cache.h"
fc04c412	2	#include "pack.h"
8a65ff76	3	#include "refs.h"
f3a3214e	4	#include "pkt-line.h"
b1bf95bb	5	#include "run-command.h"
576162a4	6	#include "exec_cmd.h"
11031d7e JS	7	#include "commit.h"
11031d7e JS	8	#include "object.h"
576162a4	9	#include <sys/wait.h>
575f4974	10
d0efc8a7	11	static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
575f4974	12
6fb75bed	13	static int deny_non_fast_forwards = 0;
fc04c412	14	static int unpack_limit = 5000;
96f1e58f	15	static int report_status;
cfee10a7	16
d4f694ba	17	static char capabilities[] = " report-status delete-refs ";
96f1e58f	18	static int capabilities_sent;
cfee10a7	19
6fb75bed SP	20	static int receive_pack_config(const char var, const char value)
	21	{
	22	git_default_config(var, value);
	23
	24	if (strcmp(var, "receive.denynonfastforwards") == 0)
	25	{
	26	deny_non_fast_forwards = git_config_bool(var, value);
	27	return 0;
	28	}
	29
fc04c412 SP	30	if (strcmp(var, "receive.unpacklimit") == 0)
	31	{
	32	unpack_limit = git_config_int(var, value);
	33	return 0;
	34	}
	35
6fb75bed SP	36	return 0;
	37	}
	38
8da19775	39	static int show_ref(const char path, const unsigned char sha1, int flag, void *cb_data)
575f4974	40	{
cfee10a7 JH	41	if (capabilities_sent)
	42	packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
	43	else
	44	packet_write(1, "%s %s%c%s\n",
	45	sha1_to_hex(sha1), path, 0, capabilities);
	46	capabilities_sent = 1;
8a65ff76	47	return 0;
575f4974 LT	48	}
575f4974 LT	49
8a65ff76	50	static void write_head_info(void)
575f4974	51	{
cb5d709f	52	for_each_ref(show_ref, NULL);
cfee10a7	53	if (!capabilities_sent)
8da19775	54	show_ref("capabilities^{}", null_sha1, 0, NULL);
cfee10a7	55
575f4974 LT	56	}
575f4974 LT	57
eb1af2df LT	58	struct command {
eb1af2df LT	59	struct command *next;
cfee10a7	60	const char *error_string;
eb1af2df LT	61	unsigned char old_sha1[20];
eb1af2df LT	62	unsigned char new_sha1[20];
8f1d2e6f	63	char ref_name[FLEX_ARRAY]; /* more */
575f4974 LT	64	};
575f4974 LT	65
96f1e58f	66	static struct command *commands;
575f4974	67
b1bf95bb JW	68	static char update_hook[] = "hooks/update";
	69
	70	static int run_update_hook(const char *refname,
	71	char old_hex, char new_hex)
	72	{
	73	int code;
	74
	75	if (access(update_hook, X_OK) < 0)
	76	return 0;
	77	code = run_command(update_hook, refname, old_hex, new_hex, NULL);
	78	switch (code) {
	79	case 0:
	80	return 0;
	81	case -ERR_RUN_COMMAND_FORK:
cfee10a7	82	return error("hook fork failed");
b1bf95bb	83	case -ERR_RUN_COMMAND_EXEC:
cfee10a7	84	return error("hook execute failed");
b1bf95bb	85	case -ERR_RUN_COMMAND_WAITPID:
cfee10a7	86	return error("waitpid failed");
b1bf95bb	87	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
cfee10a7	88	return error("waitpid is confused");
b1bf95bb	89	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
bd2afde8	90	return error("%s died of signal", update_hook);
b1bf95bb	91	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
cfee10a7	92	return error("%s died strangely", update_hook);
b1bf95bb JW	93	default:
	94	error("%s exited with error code %d", update_hook, -code);
	95	return -code;
	96	}
	97	}
	98
cfee10a7	99	static int update(struct command *cmd)
2eca23da	100	{
cfee10a7 JH	101	const char *name = cmd->ref_name;
	102	unsigned char *old_sha1 = cmd->old_sha1;
	103	unsigned char *new_sha1 = cmd->new_sha1;
3159c8dc JH	104	char new_hex[41], old_hex[41];
3159c8dc JH	105	struct ref_lock *lock;
2eca23da	106
cfee10a7 JH	107	cmd->error_string = NULL;
	108	if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
	109	cmd->error_string = "funny refname";
d8a1deec JH	110	return error("refusing to create funny ref '%s' locally",
d8a1deec JH	111	name);
cfee10a7	112	}
d8a1deec	113
2eca23da	114	strcpy(new_hex, sha1_to_hex(new_sha1));
3159c8dc	115	strcpy(old_hex, sha1_to_hex(old_sha1));
d4f694ba JH	116
d4f694ba JH	117	if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
cfee10a7	118	cmd->error_string = "bad pack";
19614330 JH	119	return error("unpack should have generated %s, "
19614330 JH	120	"but I can't find it!", new_hex);
cfee10a7	121	}
d4f694ba	122	if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
ba988a83	123	!is_null_sha1(old_sha1) &&
562cefbd	124	!strncmp(name, "refs/heads/", 11)) {
11031d7e	125	struct commit old_commit, new_commit;
9edd7e46	126	struct commit_list bases, ent;
11031d7e JS	127
	128	old_commit = (struct commit *)parse_object(old_sha1);
	129	new_commit = (struct commit *)parse_object(new_sha1);
9edd7e46 JS	130	bases = get_merge_bases(old_commit, new_commit, 1);
	131	for (ent = bases; ent; ent = ent->next)
	132	if (!hashcmp(old_sha1, ent->item->object.sha1))
11031d7e	133	break;
9edd7e46 JS	134	free_commit_list(bases);
9edd7e46 JS	135	if (!ent)
11031d7e	136	return error("denying non-fast forward;"
9edd7e46	137	" you should pull first");
11031d7e	138	}
b1bf95bb	139	if (run_update_hook(name, old_hex, new_hex)) {
cfee10a7	140	cmd->error_string = "hook declined";
bd2afde8	141	return error("hook declined to update %s", name);
b1bf95bb	142	}
3159c8dc	143
d4f694ba JH	144	if (is_null_sha1(new_sha1)) {
	145	if (delete_ref(name, old_sha1)) {
	146	cmd->error_string = "failed to delete";
	147	return error("failed to delete %s", name);
	148	}
	149	fprintf(stderr, "%s: %s -> deleted\n", name, old_hex);
	150	}
	151	else {
	152	lock = lock_any_ref_for_update(name, old_sha1);
	153	if (!lock) {
	154	cmd->error_string = "failed to lock";
	155	return error("failed to lock %s", name);
	156	}
	157	write_ref_sha1(lock, new_sha1, "push");
	158	fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
19614330	159	}
3159c8dc	160	return 0;
2eca23da LT	161	}
2eca23da LT	162
19614330 JH	163	static char update_post_hook[] = "hooks/post-update";
	164
	165	static void run_update_post_hook(struct command *cmd)
	166	{
	167	struct command *cmd_p;
	168	int argc;
9201c707	169	const char **argv;
19614330 JH	170
	171	if (access(update_post_hook, X_OK) < 0)
	172	return;
	173	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
cfee10a7	174	if (cmd_p->error_string)
19614330 JH	175	continue;
	176	argc++;
	177	}
	178	argv = xmalloc(sizeof(argv) (1 + argc));
	179	argv[0] = update_post_hook;
	180
	181	for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
9201c707	182	char *p;
cfee10a7	183	if (cmd_p->error_string)
19614330	184	continue;
9201c707 JH	185	p = xmalloc(strlen(cmd_p->ref_name) + 1);
	186	strcpy(p, cmd_p->ref_name);
	187	argv[argc] = p;
19614330 JH	188	argc++;
	189	}
	190	argv[argc] = NULL;
128aed68	191	run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
19614330	192	}
2eca23da	193
575f4974 LT	194	/*
	195	* This gets called after(if) we've successfully
	196	* unpacked the data payload.
	197	*/
	198	static void execute_commands(void)
	199	{
eb1af2df LT	200	struct command *cmd = commands;
	201
	202	while (cmd) {
cfee10a7	203	update(cmd);
eb1af2df	204	cmd = cmd->next;
575f4974	205	}
19614330	206	run_update_post_hook(commands);
575f4974 LT	207	}
	208
	209	static void read_head_info(void)
	210	{
eb1af2df	211	struct command **p = &commands;
575f4974 LT	212	for (;;) {
575f4974 LT	213	static char line[1000];
eb1af2df LT	214	unsigned char old_sha1[20], new_sha1[20];
eb1af2df LT	215	struct command *cmd;
cfee10a7 JH	216	char *refname;
cfee10a7 JH	217	int len, reflen;
eb1af2df LT	218
eb1af2df LT	219	len = packet_read_line(0, line, sizeof(line));
575f4974 LT	220	if (!len)
575f4974 LT	221	break;
eb1af2df LT	222	if (line[len-1] == '\n')
	223	line[--len] = 0;
	224	if (len < 83 \|\|
	225	line[40] != ' ' \|\|
	226	line[81] != ' ' \|\|
	227	get_sha1_hex(line, old_sha1) \|\|
	228	get_sha1_hex(line + 41, new_sha1))
cfee10a7 JH	229	die("protocol error: expected old/new/ref, got '%s'",
	230	line);
	231
	232	refname = line + 82;
	233	reflen = strlen(refname);
	234	if (reflen + 82 < len) {
	235	if (strstr(refname + reflen + 1, "report-status"))
	236	report_status = 1;
	237	}
eb1af2df	238	cmd = xmalloc(sizeof(struct command) + len - 80);
e702496e SP	239	hashcpy(cmd->old_sha1, old_sha1);
e702496e SP	240	hashcpy(cmd->new_sha1, new_sha1);
eb1af2df	241	memcpy(cmd->ref_name, line + 82, len - 81);
cfee10a7	242	cmd->error_string = "n/a (unpacker error)";
eb1af2df LT	243	cmd->next = NULL;
	244	*p = cmd;
	245	p = &cmd->next;
575f4974 LT	246	}
	247	}
	248
fc04c412 SP	249	static const char parse_pack_header(struct pack_header hdr)
	250	{
	251	char c = (char)hdr;
	252	ssize_t remaining = sizeof(struct pack_header);
	253	do {
	254	ssize_t r = xread(0, c, remaining);
	255	if (r <= 0)
	256	return "eof before pack header was fully read";
	257	remaining -= r;
	258	c += r;
	259	} while (remaining > 0);
	260	if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
	261	return "protocol error (pack signature mismatch detected)";
	262	if (!pack_version_ok(hdr->hdr_version))
	263	return "protocol error (pack version unsupported)";
	264	return NULL;
	265	}
	266
576162a4 NP	267	static const char *pack_lockfile;
576162a4 NP	268
861ed121	269	static const char *unpack(void)
575f4974	270	{
fc04c412 SP	271	struct pack_header hdr;
	272	const char *hdr_err;
	273	char hdr_arg[38];
fc04c412 SP	274
	275	hdr_err = parse_pack_header(&hdr);
	276	if (hdr_err)
	277	return hdr_err;
	278	snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
	279	ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
	280
	281	if (ntohl(hdr.hdr_entries) < unpack_limit) {
576162a4	282	int code;
fc04c412 SP	283	const char *unpacker[3];
	284	unpacker[0] = "unpack-objects";
	285	unpacker[1] = hdr_arg;
	286	unpacker[2] = NULL;
	287	code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
576162a4	288	switch (code) {
fc04c412 SP	289	case 0:
	290	return NULL;
	291	case -ERR_RUN_COMMAND_FORK:
	292	return "unpack fork failed";
	293	case -ERR_RUN_COMMAND_EXEC:
	294	return "unpack execute failed";
	295	case -ERR_RUN_COMMAND_WAITPID:
	296	return "waitpid failed";
	297	case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
	298	return "waitpid is confused";
	299	case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
	300	return "unpacker died of signal";
	301	case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
	302	return "unpacker died strangely";
	303	default:
	304	return "unpacker exited with error code";
576162a4 NP	305	}
	306	} else {
	307	const char *keeper[6];
	308	int fd[2], s, len, status;
	309	pid_t pid;
	310	char keep_arg[256];
	311	char packname[46];
	312
	313	s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
	314	if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
	315	strcpy(keep_arg + s, "localhost");
	316
	317	keeper[0] = "index-pack";
	318	keeper[1] = "--stdin";
	319	keeper[2] = "--fix-thin";
	320	keeper[3] = hdr_arg;
	321	keeper[4] = keep_arg;
	322	keeper[5] = NULL;
	323
	324	if (pipe(fd) < 0)
	325	return "index-pack pipe failed";
	326	pid = fork();
	327	if (pid < 0)
	328	return "index-pack fork failed";
	329	if (!pid) {
	330	dup2(fd[1], 1);
	331	close(fd[1]);
	332	close(fd[0]);
	333	execv_git_cmd(keeper);
	334	die("execv of index-pack failed");
	335	}
	336	close(fd[1]);
	337
	338	/*
	339	* The first thing we expects from index-pack's output
	340	* is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
	341	* %40s is the newly created pack SHA1 name. In the "keep"
	342	* case, we need it to remove the corresponding .keep file
	343	* later on. If we don't get that then tough luck with it.
	344	*/
	345	for (len = 0;
	346	len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
	347	len += s);
	348	close(fd[0]);
	349	if (len == 46 && packname[45] == '\n' &&
	350	memcmp(packname, "keep\t", 5) == 0) {
	351	char path[PATH_MAX];
	352	packname[45] = 0;
	353	snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
	354	get_object_directory(), packname + 5);
	355	pack_lockfile = xstrdup(path);
	356	}
	357
	358	/* Then wrap our index-pack process. */
	359	while (waitpid(pid, &status, 0) < 0)
	360	if (errno != EINTR)
	361	return "waitpid failed";
	362	if (WIFEXITED(status)) {
	363	int code = WEXITSTATUS(status);
	364	if (code)
	365	return "index-pack exited with error code";
	366	reprepare_packed_git();
	367	return NULL;
	368	}
369	return "index-pack abnormal exit";
cfee10a7 JH	370	}
	371	}
	372
	373	static void report(const char *unpack_status)
	374	{
	375	struct command *cmd;
	376	packet_write(1, "unpack %s\n",
	377	unpack_status ? unpack_status : "ok");
	378	for (cmd = commands; cmd; cmd = cmd->next) {
	379	if (!cmd->error_string)
	380	packet_write(1, "ok %s\n",
	381	cmd->ref_name);
	382	else
	383	packet_write(1, "ng %s %s\n",
	384	cmd->ref_name, cmd->error_string);
575f4974	385	}
cfee10a7	386	packet_flush(1);
575f4974 LT	387	}
575f4974 LT	388
d4f694ba JH	389	static int delete_only(struct command *cmd)
	390	{
	391	while (cmd) {
	392	if (!is_null_sha1(cmd->new_sha1))
	393	return 0;
	394	cmd = cmd->next;
	395	}
	396	return 1;
	397	}
	398
575f4974 LT	399	int main(int argc, char **argv)
575f4974 LT	400	{
d0efc8a7	401	int i;
8d630132	402	char *dir = NULL;
575f4974 LT	403
	404	argv++;
	405	for (i = 1; i < argc; i++) {
8d630132	406	char arg = argv++;
575f4974 LT	407
575f4974 LT	408	if (*arg == '-') {
575f4974 LT	409	/* Do flag handling here */
	410	usage(receive_pack_usage);
	411	}
d0efc8a7 LT	412	if (dir)
d0efc8a7 LT	413	usage(receive_pack_usage);
575f4974	414	dir = arg;
575f4974 LT	415	}
	416	if (!dir)
	417	usage(receive_pack_usage);
	418
3159c8dc	419	if (!enter_repo(dir, 0))
8d630132	420	die("'%s': unable to chdir or not a git archive", dir);
575f4974	421
94d8213f	422	setup_ident();
6fb75bed SP	423	git_config(receive_pack_config);
6fb75bed SP	424
8a65ff76	425	write_head_info();
575f4974 LT	426
575f4974 LT	427	/* EOF */
f3a3214e	428	packet_flush(1);
575f4974 LT	429
575f4974 LT	430	read_head_info();
7f8e9828	431	if (commands) {
d4f694ba JH	432	const char *unpack_status = NULL;
	433
	434	if (!delete_only(commands))
	435	unpack_status = unpack();
cfee10a7 JH	436	if (!unpack_status)
cfee10a7 JH	437	execute_commands();
576162a4 NP	438	if (pack_lockfile)
576162a4 NP	439	unlink(pack_lockfile);
cfee10a7 JH	440	if (report_status)
cfee10a7 JH	441	report(unpack_status);
7f8e9828	442	}
575f4974 LT	443	return 0;
575f4974 LT	444	}